BANGKOK — Interpol said today it has launched a multi-national investigation into what Thailand has dubbed the “Baby Factory” case: a 24-year-old Japanese businessman who has 16 surrogate babies and an alleged desire to father hundreds more. Police raided a Bangkok condominium earlier this month and found nine babies and nine nannies living in a few unfurnished rooms filled with baby bottles, bouncy chairs, playpens and diapers. They have since identified Mitsutoki Shigeta as the father of those …